Troubled mermaid

Her life had been hard, she had been in a foster care until she aged up, then she took whatever job she could work, times were tough but she managed to get a job on a construction site and had been working a very hard labour job for five years, she had tried to make friends but there just was no time, her life revolved around working so she could live but she spent her short time reading her stories, there she could escape her hardship and enter a new world, never would she had thought that she would really enter a new world, a world that was just as deadly as it was beautiful, she transmigrated into one of the story she had read beauty and the beasts, unfortunately or fortunately she did not transmigrate into the female lead but the mermaid Qin, they only things she wanted to do was to survive and steal the males she wanted from the female lead, she could find a new harem since she wanted hers.